Abstract—This article discusses the benefit cost analysis aspects of millimetre wavebands (mmWaves) and Super High Frequency (SHF). The devaluation along the distance of the carrier-to-noise- plus-interference ratio with the coverage distance is assessed by considering two different path loss models, the two-slope urban micro Line-of-Sight (UMiLoS) for the SHF band and the modified Friis propagation model, for frequencies above 24 GHz. The equivalent supported throughput is estimated at the 5.62, 28, 38, 60 and 73 GHz frequency bands and the influence of carrier-to-noise- plus-interference ratio in the radio and network optimization process is explored. Mostly owing to the lessening caused by the behaviour of the two-slope propagation model for SHF band, the supported throughput at this band is higher than at the millimetre wavebands only for the longest cell lengths. The benefit cost analysis of these pico-cellular networks was analysed for regular cellular topologies, by considering the unlicensed spectrum. For shortest distances, we can distinguish an optimal of the revenue in percentage terms for values of the cell length, R ≈ 10 m for the millimeter wavebands and for longest distances an optimal of the revenue can be observed at R ≈ 550 m for the 5.62 GHz. It is possible to observe that, for the 5.62 GHz band, the profit is slightly inferior than for millimetre wavebands, for the shortest Rs, and starts to increase for cell lengths approximately equal to the ratio between the break-point distance and the co-channel reuse factor, achieving a maximum for values of R approximately equal to 550 m. Keywords—5G, millimetre wavebands, super high-frequency band, SINR, signal-to-interference-plus-noise ratio, cost benefit analysis. I. INTRODUCTION ELLULAR planning can be optimized by studying the system’s performance concerning its fundamental parameters. This work compares the carrier-to-noise-plus- interference ratio (SINR or CNIR) and the supported throughput for millimetre wavebands (mmWaves) and SHF band within the framework of 5G New Radio (NR) mobile networks while considering the linear and Manhattan grid topologies as in [1], as shown in Fig. 1, where reuse pattern K = 3 is assumed. In this work, aiming at evaluating the proposed deployments, two propagation models are considered: the two- Emanuel Teixeira*, Anderson Ramos, Marisa Lourenço, and Fernando J. Velez are with the Instituto das Telecomunicações and DEM, Universidade da Beira Interior, Faculdade de Engenharia, 6201-001 Covilhã, Portugal (*e- mail: emanuelt@ubi.pt). Jon M. Peha is with the Dept. of Electrical and Computer Engineering, Dept. of Engineering & Public Policy, Carnegie Mellon, University, Pittsburgh, PA 15213-3890, USA, (e-mail: peha@cmu.edu). slope propagation model, for the SHF band [2], and the modified Friis propagation, at mmWaves. The general description of 5G NR was given by Rel. 15 of the Third Generation Partnership Project (3GPP) and allows for the deployment of a complete commercial network with a service-based architecture employing the concept of modularity [3], with the elements of the architecture, called network functions (NFs), offering their services via a common framework that will allow communications with speeds up to 2 Gbps, in both downlink and uplink directions. Rel. 15 has also established two sets of frequencies identified as frequency range 1 (FR1) and frequency range 2 (FR2). FR1 comprises the sub-6 GHz frequency range (450- 6000 MHz) while FR2 is the mmWaves (24250-52600 MHz). In this work, one considers carrier frequencies in both ranges and a bandwidth of 100 MHz that allows for a total of 270 physical resource blocks (PRBs) with 60 kHz sub-carrier spacing. Besides, in order to map the minimum CNIR, CNIR min , into the supported throughput, R b , we have considered the values for CNIR min from 3GPP [4]. After obtaining the results for the system capacity of small cells, we study the benefit cost analysis aspects. It is possible to classify the system’s cost into two parts, i.e., capital costs and operating costs. The first category considers fixed expenses such as spectrum auctions (where costs are null for unlicensed spectrum) and the number of Base Stations (BS) and transceivers per unit of area, while the second class considers the expenses to operate and maintain the system. Revenues depend on the price per MB and on the supported throughput. The remainder of the paper is organized as follows. Section II starts by presenting a general description non-standalone 5G NR. Section III describes the path loss models for millimetre wavebands and SHF band. In Section IV, the CNIR is analysed. Section V addresses system capacity by studying the variation of CNIR and supported throughput with the cell length. In Section VI, the capacity/cost trade-off is addressed. Finally, conclusions are drawn in Section VII. II. 5G NR 5G is expected to operate in backward compatibility with LTE/LTE-A in the non-standalone phase, considering both technologies, the cells could offer diverse or the same coverage. Within 5G NR deployment scenarios, among other topologies, it is possible to have a LTE/LTE-A eNB (evolved NodeB) as a master node, offering an anchor carrier that can Emanuel Teixeira, Anderson Ramos, Marisa Lourenço, Fernando J. Velez, Jon M. Peha Cost Benefit Analysis: Evaluation among the Millimetre Wavebands and SHF Bands of Small Cell 5G Networks C World Academy of Science, Engineering and Technology International Journal of Electrical and Computer Engineering Vol:14, No:7, 2020 203 International Scholarly and Scientific Research & Innovation 14(7) 2020 ISNI:0000000091950263 Open Science Index, Electrical and Computer Engineering Vol:14, No:7, 2020 waset.org/Publication/10011336